Commit db67d661 authored by Arik Nemtsov's avatar Arik Nemtsov Committed by Johannes Berg
Browse files

mac80211: implement proper Tx path flushing for TDLS 



As the spec mandates, flush data in the AP path before transmitting the
first setup frame. Data packets transmitted during setup are already
dropped in the Tx path.

For the teardown flow, flush all packets in the direct path before
transmitting the teardown frame. Un-authorize the peer sta after teardown
is sent, forcing all subsequent Tx to the peer through the AP.

Make sure to flush the queues when disabling the link to get the
teardown packet out.

Signed-off-by: default avatarArik Nemtsov <arikx.nemtsov@intel.com>
[adjust to Luca's new quuee API and stop only vif queues]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 191dd469

net/mac80211/ieee80211_i.h

+1 −0
Original line number Diff line number Diff line
@@ -925,6 +925,7 @@ enum queue_stop_reason { 
	IEEE80211_QUEUE_STOP_REASON_SKB_ADD,

	IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,

	IEEE80211_QUEUE_STOP_REASON_FLUSH,

	IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN,



	IEEE80211_QUEUE_STOP_REASONS,

};

net/mac80211/tdls.c

+57 −0
Original line number Diff line number Diff line
@@ -331,6 +331,8 @@ ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, 
		goto exit;

	}



	ieee80211_flush_queues(local, sdata);



	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,

					      dialog_token, status_code,

					      peer_capability, initiator,
@@ -348,6 +350,52 @@ exit: 
	return ret;

}



static int

ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev,

			     const u8 *peer, u8 action_code, u8 dialog_token,

			     u16 status_code, u32 peer_capability,

			     bool initiator, const u8 *extra_ies,

			     size_t extra_ies_len)

{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;

	struct sta_info *sta;

	int ret;



	/*

	 * No packets can be transmitted to the peer via the AP during setup -

	 * the STA is set as a TDLS peer, but is not authorized.

	 * During teardown, we prevent direct transmissions by stopping the

	 * queues and flushing all direct packets.

	 */

	ieee80211_stop_vif_queues(local, sdata,

				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);

	ieee80211_flush_queues(local, sdata);



	ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code,

					      dialog_token, status_code,

					      peer_capability, initiator,

					      extra_ies, extra_ies_len);

	if (ret < 0)

		sdata_err(sdata, "Failed sending TDLS teardown packet %d\n",

			  ret);



	/*

	 * Remove the STA AUTH flag to force further traffic through the AP. If

	 * the STA was unreachable, it was already removed.

	 */

	rcu_read_lock();

	sta = sta_info_get(sdata, peer);

	if (sta)

		clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);

	rcu_read_unlock();



	ieee80211_wake_vif_queues(local, sdata,

				  IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN);



	return 0;

}



int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,

			const u8 *peer, u8 action_code, u8 dialog_token,

			u16 status_code, u32 peer_capability,
@@ -374,6 +422,12 @@ int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, 
						extra_ies, extra_ies_len);

		break;

	case WLAN_TDLS_TEARDOWN:

		ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer,

						   action_code, dialog_token,

						   status_code,

						   peer_capability, initiator,

						   extra_ies, extra_ies_len);

		break;

	case WLAN_TDLS_SETUP_CONFIRM:

	case WLAN_TDLS_DISCOVERY_REQUEST:

	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
@@ -442,6 +496,9 @@ int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, 
		ret = 0;

		break;

	case NL80211_TDLS_DISABLE_LINK:

		/* flush a potentially queued teardown packet */

		ieee80211_flush_queues(local, sdata);



		ret = sta_info_destroy_addr(sdata, peer);

		break;

	default:

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